Questions tagged [hvac]
(Heating, Ventilating, and Air Conditioning) For questions about installing, repairing, and troubleshooting HVAC systems.
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5 views
Where should my furnace filter go in a Lennox G40UH24A045 series furnace (Merit)?
I cannot find the filter and my furnace is not providing any heat.
The limit switch is working fine as is the flame sensor.
Diagnostic lights are: 1 slow bling 2 on
Any clues?
Thanks
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24 views
Old thermostat to Hive thermostat
My wife decided we needed a smart thermostat... which means I need to install said thermostat...
Currently a Bryant Evolution series is mounted. She purchased the Hive with Hub when it was on sale.
...
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0answers
12 views
how to communicate thermostat to turn on wood heat system when during heat pump defrost cycle
I have physically disconnected the strip heaters in my air handler but the fan still runs which I do not want. I have a wood boiler I want to run in place of the aux heat
Can I disconnect the white ...
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1answer
40 views
How can I prevent makeup air vents from exhausting conditioned air?
The utility room has two 8-10 inch ducts running to it from the exterior of the home. There are also three fireplaces in the home, and we have noticed that occasionally the house smells like smoke, ...
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2answers
42 views
How do I install flex duct to existing duct including registers
When my home was built in 2016 the HVAC runs from the furnace in the basement up through the house uses 7" R4.2 insulated flex duct.
I am in the process of finishing my basement and I would like to ...
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0answers
17 views
My furnace blower will not turn on when on when in E-heat mode with auto fan
I have an electric furnace Carrier model FB4ANF030. I enclosed the wiring diagram.
Issue:
The blower fan will not turn on automatically when the thermostat is set to "Emergency heat" and "Fan Auto". ...
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0answers
9 views
Hvac electric furnace Nordyne E1EH-012HA
I have a problem with Nordyne electric furnace with A/c coil above. It started the winter short cycling, then did nothing.
I became a YouTube maniac trying to figure out the problem. I first replaced ...
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2answers
50 views
Tankless hot water to heat home
I have a 1200 square foot second floor apartment that is presently heated using a forced hot water radiator system. The system is called a Paloma "Paloma Pak" heating system. It is basically a ...
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0answers
22 views
Can I use an available wire as a C-wire by adding it to an unoccupied 24v terminal?
I want to add new thermostats in my home. Luckily, the wiring to my thermostat has an unused wire in the bundle for the required "C-Wire". It has R,G,Y,W, and an unused blue. The thermostat wiring ...
3
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1answer
28 views
Can't find HVAC C terminal
Could any of these be the c terminal on my hvac unit? There's already a c wire there, just can't figure out where to connect it.
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1answer
24 views
2 Air Filters in Air Conditioning Unit
My air conditioning system has a 2-layered (each 1") filter holder, definitely made for two filters. My idea, to improve the filter life and have the least air flow restriction, is to have the initial ...
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0answers
15 views
How to dimension air ducts for a combination heater/HRV?
I am looking at this product (version RK5) for both heat recovery ventilation and supplementary heating via warm air (seasonally).
It has an extra inlet for air recirculation, which it can mix with ...
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1answer
29 views
How can I deal with a heat pump condenser producing lots of water?
Heat pumps was replaced in 2017. North Florida has had moderately cool weather (50-60 degrees F) recently. I noticed water underneath one of the units.
Is the water pooling normal? If yes, why?
If ...
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0answers
23 views
Solar panel as a hatch and Is sleeping under a solar panel safe?
I'm looking to build a very large custom roof hatch/vent on my van. I was going to make to top out of Lexan, but then I realized I might want a large solar panel on the roof as well. I was looking at ...
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0answers
20 views
Fan Blows Constantly Even With C Wire
Nest stated that my furnace only set up (we have an evap cooler) would work with their Nest E product. I self installed only two wires, R and W. The heating works; however, the fan always blows ...
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0answers
18 views
Fan only mode not turning on blower - 2 wire blower
Our manufactured home has a colman furnace and for heating it works fine. I would like to use the fan only mode when we have the fire place going but it is not hooked up, and I just want to make sure ...
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2answers
29 views
Can I upsize my air conditioner if I have a two-speed compressor?
The upper floor of my house has a split A/C, three-ton. When the temperature gets up above about 95 Fahrenheit, the unit can't keep the upstairs cool. That means that for a few weeks a year, my kids'...
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0answers
24 views
Is an alcohol-based spray cleaner ok for cleaning an aluminum AC evaporator coil?
Simple alcohols such as ethanol can, apparently, corrode aluminum. However, this corrosion reaction seems to be very slow at room temperature and below. Is an ethanol based, non-foaming spray cleaner, ...
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1answer
21 views
Zone Controller T-Stat Wiring w/ 24V transformer, isolation relays for 2 zones
I have a new Navien SmartZone+ 6-Zone Control for my boiler-based heating system. It is great, except it provides no power on C.
I realize the internet has researched the heck out of adding a C ...
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0answers
26 views
Why does the compressor continue to run after the fan is switched off?
I have a split system with two fan motors running from one compressor. When I turned off the fan motor, the compressor kept running. I couldn't turn it off, even when I went to the electricity board ...
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1answer
52 views
Why is my steam radiator rattling like this, and what can I do about it?
I have one-pipe steam radiators in a home built in 1905 (condoized in 1998). Only one of the radiators, the largest, makes this awful rattling sound when the system heats up:
https://youtu.be/...
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0answers
13 views
Coleman Wall furnace in 1967 mobile home gas model # 8670A
My old wall gas furnace blower motor keeps running and shutting off not cooling the system down and smells hot inside and outside?
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0answers
18 views
Nest thermostat installation to furnace and heat pump
We have
T874G1196 thermostat by york (can only find honeywell documentation)
MB7BM-1200K-B air handler
H8HK015H-21 electric heater
Thermopump (heating and cooling)
We want to connect it to a nest ...
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0answers
12 views
Replacing Flame Sensor on Ruud Silhouette Furnace
I'm quite new when it comes to looking at furnaces. The furnace in my house recently started shutting off before getting to the temperature the thermostat is set to. Eventually we'd reset the whole ...
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2answers
5k views
Half my house losing power, HVAC the key factor
For the past couple of weeks I have been losing power occasionally to half my house. My central AC goes out, half my kitchen, living room and my kids' rooms. There are no tripped breakers though.
I ...
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1answer
14 views
How to fix A0 error code of a Daikin split system air conditioner
When I tried to turn on my split system AC today, the indicator light just kept blinking and the air conditioning was not on.
Here is the error code as displayed on the remote
According to what I ...
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0answers
9 views
Open ceiling duct in finished basement
Moved into a new house that was only used as a summer home and had a portion of the basement finished. They tapped into existing duct work from my HVAC system to run into the finished area but bc it's ...
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3answers
45 views
How to seal joints in ductwork when tape is not an option
The duct-work in the basement for my forced air heating system has been modified at various points over its long history and as a result had quite a few leaks when I moved in recently. I used foil ...
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1answer
5 views
Draft Inducer replacement motor part number
The draft inducer motor in my Payne furnace started making a whining sound the other night, so I ordered a replacement from Ebay. My part number is HC21ZE121A, and the motor I got is missing the 'A' ...
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2answers
32 views
Is there harm in using my mini-splits in conjunction with my hot-water baseboard heat?
My new house has a natural gas boiler with three zones of radiant baseboard heat (one per floor). It also has a mini-split system (again one head per floor). The mini-split was advertised as air ...
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1answer
19 views
Carrier Furnace 58STX110-14122 fan starts the first time, but fails to start at subsequent calls for heat
On a Carrier Furnace model #58STX110-14122, when the initial call for heat comes on, everything works just fine in the following order:
Thermostat sends a call for heat
Draft Inducer motor kicks on
...
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0answers
24 views
AC Common wire disappears
On my furnace there is a wire that is labeled C/Common. But at my thermostat there is no common wire.
Wires on furnace control panel:
W - White
Y - Yellow
G - Green
C - Common
Wires at my thermostat:
...
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2answers
39 views
venting a range hood outside on our cedar cabin
i need to vent our range hood outside on our cedar cabin and it is on the front of the house we would like it to be as inconspicuous as possible I can not find a vent that would work well with a cedar ...
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0answers
64 views
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2answers
56 views
Why is this airduct twitching and making a noise?
I have an air duct in my basement. It leads from my furnace (I think?) to the outside world.
However, as you can see from this video, it is "twitching".
Every second or so it jerks slightly and ...
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1answer
25 views
Bad Limit Switch?
My Nest thermostat is not working and it says the red wire is not getting power. The gas company man poked around the furnace and thinks it is a bad limit switch. Question: can a bad limit switch stop ...
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2answers
48 views
Is 4“ Ducting Used for a 4” Bath Fan?
I'm interested in installing a bath fan and am currently planning ou the project.
The fan specs (https://www.homedepot.com/p/Delta-Breez-GreenBuilder-Series-100-CFM-Wall-or-Ceiling-Bathroom-Exhaust-...
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1answer
20 views
Blower turns on and off even though the unit is satisfied
My heater works fine when I set the temperature to 69 and the temperature hits the desired temp it shuts off, then about 2 mins later the blower turns on like the heater is going to start up again, ...
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4answers
119 views
Best Way to Heat a Ductless Multi-Level Home
I just bought a home and it desperately needs an update to its heating. It currently has baseboard electric resistance heaters in every room. There is no duct-work in the house. We're in cold humid ...
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0answers
19 views
HVAC indoor fan stuck buzzing
My old Sanyo SAP-KRV123EHA had a noisy ball bearing in the indoor fan unit. Since Sanyo is no longer making these units I tried replacing the fan bearing with ceramic ones. After assembling the motor, ...
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0answers
18 views
Heat Pump in emergency heat only
My heat pump is operating in emergency heat nonstop regardless of outside temps. The condensor fan will turn on for about 5 seconds then kick off. The refrigerent line is frozen at the valve into the ...
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1answer
28 views
nest 2nd gen, no common wire/terminal in the fan coil unit
I'm trying to install an older nest in my condo but it immediately complains that there's no common wire attached (error e24). I opened up the fan coil in my condo and there is no specific terminal ...
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2answers
40 views
Hot water (steam?) gas boiler not engaging burners, low pressure, sight glass full
At the beginning of the winter season my boiler wasn't turning on, but I got it to work by turning on the inlet valve and just letting it feed water until the gas burners kicked in. The sight glass ...
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1answer
60 views
What powers a Nest thermostat? [duplicate]
I have an older thermostat I'd like to replace with the more modern Nest thermostat. The online Nest compatibility checker tells me that I have a compatible device. However, I'm not sure how it could ...
0
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0answers
13 views
Natural Gas Water Heater Pilot Out/Orange when relit
Any help would be appreciated. Live in a condo. Water heater, furnace and up-down washer/dryer in same closet. (all condos like this). Water Heater pilot continues to go out. (leave closet door open ...
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1answer
32 views
Restrictions on 90 Degree Elbow for a Bathroom Exhaust Fan?
The manual for a certain (100CFM/4") bathroom exhaust fan has a restriction on using 90-degree elbows close to the unit.
Why is this? Is it okay to use 90-degree elbows further down the exhaust path? ...
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2answers
48 views
What Type of Ducting Should Be Used for a Bathroom Exhaust Fan?
I'm planning on installing a Bathroom exhaust fan (Just a note, the port is 4") and am curious as to what kind of duct should be used.
I've heard that the duct should be insulated to prevent water ...
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0answers
11 views
Fan blows only when thermostat is set to fan “on”
For over two years now my fan only works when the switch is set to on it does this both in AC mode and heat mode if it is switched to auto the fan never kicks on and during heat mode I get a burning ...
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0answers
38 views
Why doesn't my furnace fan run when there's heat in the system?
Have a Trane xv80. Recently we have issue in furnace heater. It stops after a few minutes of heat call and fails due to highr limit device failure.
I replaced the high limit switch recently. It is ...
3
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1answer
49 views
How much clearance do I need above a floor vent?
I am building a custom shelving unit that will sit over an inconveniently located floor vent/diffuser. My thought is to raise the bottom shelf up on stubby legs so that it does not block the vent. The ...
